2 important Need to Knows

Hi guys to important questions for you-

1. With virtual dub, do i just open the file i want to convert(import it) then immediately go to
'Save As' saving it as an AVI file, and then it should convert the Vob to Avi?
or is their a step I'm missing

2. Due to the fact I can't save any of my work (because i can't convert it back for editing)
Does anyone know how to save it straight back to the video camcorder it's original come off?

another words back to the tape?

I think from what I've read, this is something to do with 'On Line' video editing.